128256735234377 has 8 divisors (see below), whose sum is σ = 137097337345920. Its totient is φ = 119688151649440.

The previous prime is 128256735234317. The next prime is 128256735234427. The reversal of 128256735234377 is 773432537652821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128256735234377 - 2²⁸ = 128256466798921 is a prime.

It is a super-2 number, since 2×128256735234377² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128256735234317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68004630677 + ... + 68004632562.

It is an arithmetic number, because the mean of its divisors is an integer number (17137167168240).

Almost surely, 2^{128256735234377} is an apocalyptic number.

It is an amenable number.

128256735234377 is a deficient number, since it is larger than the sum of its proper divisors (8840602111543).

128256735234377 is a wasteful number, since it uses less digits than its factorization.

128256735234377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136009263303.

The product of its digits is 355622400, while the sum is 65.

The spelling of 128256735234377 in words is "one hundred twenty-eight trillion, two hundred fifty-six billion, seven hundred thirty-five million, two hundred thirty-four thousand, three hundred seventy-seven".